2605321 has 4 divisors (see below), whose sum is σ = 2654532. Its totient is φ = 2556112.

The previous prime is 2605319. The next prime is 2605349. The reversal of 2605321 is 1235062.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1235062 = 2 ⋅617531.

It can be written as a sum of positive squares in 2 ways, for example, as 1729225 + 876096 = 1315^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605321 - 2¹ = 2605319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24526 + ... + 24631.

It is an arithmetic number, because the mean of its divisors is an integer number (663633).

2^2605321 is an apocalyptic number.

It is an amenable number.

2605321 is a deficient number, since it is larger than the sum of its proper divisors (49211).

2605321 is an equidigital number, since it uses as much as digits as its factorization.

2605321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49210.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2605321 is about 1614.1006783965. The cubic root of 2605321 is about 137.6006271661.

It can be divided in two parts, 2605 and 321, that added together give a triangular number (2926 = T₇₆).

The spelling of 2605321 in words is "two million, six hundred five thousand, three hundred twenty-one".